Filling valve



FIG. 1 is a perspective view of a filling valve according to my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof; and,

FIG. 7 is a bottom view thereof.

The stippling in the design indicates contrast and does not indicate color. 

CLAIM The ornamental design for a filling valve, as shown and described. 